CN112410481B - Method for preparing hot-pressed blocks from low-grade iron and high-titanium blast furnace slag - Google Patents
Method for preparing hot-pressed blocks from low-grade iron and high-titanium blast furnace slag Download PDFInfo
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- CN112410481B CN112410481B CN202011179809.7A CN202011179809A CN112410481B CN 112410481 B CN112410481 B CN 112410481B CN 202011179809 A CN202011179809 A CN 202011179809A CN 112410481 B CN112410481 B CN 112410481B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a method for preparing hot-pressed blocks by using low-grade iron and high-titanium blast furnace slag, which comprises the following steps: crushing the low-grade iron and high-titanium blast furnace slag, and then carrying out magnetic separation in 3000 Gauss 2000-plus and 1000-Gauss 500-plus magnetic fields in sequence to obtain iron slag; crushing the slag iron, mixing the crushed slag iron with a reducing agent, and drying to obtain a mixture; preheating the mixture at the temperature of 400-1300 ℃, then reducing the mixture at the temperature of 1200-1300 ℃, cooling the mixture to be below 200 ℃, and then carrying out magnetic separation and crushing in sequence to obtain magnetic separation iron; and pressing the magnetic iron to obtain a hot pressed block. The process of the invention is simple and easy to control, reasonably utilizes the iron in the low-grade iron high-titanium blast furnace slag, prepares the iron into hot-pressed blocks, can be directly put into a furnace for use, and effectively solves the problems of high slag-iron separation difficulty, high treatment cost, easy secondary pollution generation and the like in the prior art.
Description
Technical Field
The invention relates to the technical field of recycling of high-titanium blast furnace slag, in particular to a method for preparing hot-pressed blocks from low-grade iron high-titanium blast furnace slag.
Background
In recent years, with the continuous development of metallurgical industry, a large amount of metallurgical slag is accumulated, and all scientific research units are performing comprehensive utilization research on metallurgical slag. Blast furnace slag produced by smooth steel climbing iron making reaches about 400 million tons every year, and because the components and ore phases in the high-titanium blast furnace slag are complex and belong to artificial ores, valuable elements in the high-titanium blast furnace slag are required to be separated and fully utilized, the difficulty is high, at present, iron and slag are mainly separated, and then the iron and the slag are separately researched and utilized. Iron-containing substances are separated through magnetic separation, about 22 ten thousand tons of iron-containing substances can be recovered all the year round, but the high-grade iron slag recovered through magnetic separation is about 7-8 ten thousand tons, and the high-grade iron can be directly recycled; and 10 more than ten thousand tons of low-iron grade blast furnace slag iron is inconvenient to process. The low-grade iron slag contains less than 30 percent of metallic iron, and mainly because most of iron in the slag is embedded in the slag in a granular manner to form slag ladle iron and iron ladle slag, the iron in the slag is characterized by dispersion and fineness, the difficulty is high when the separation of the slag and the iron is realized, the treatment cost of the existing available method is high, secondary pollution is easy to generate, and great obstruction is caused to the recycling of the low-grade iron in the high-grade slag.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method for preparing the hot-pressed blocks by using the low-grade iron high-titanium blast furnace slag, the process is simple and easy to control, iron in the low-grade iron high-titanium blast furnace slag is reasonably utilized and prepared into the hot-pressed blocks, the hot-pressed blocks can be directly put into a furnace for use, and the problems of high difficulty in separating iron from slag, high treatment cost, easiness in generating secondary pollution and the like in the prior art are effectively solved.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problem is as follows: the method for preparing the hot-pressed blocks by using the low-grade iron high-titanium blast furnace slag comprises the following steps:
(1) crushing the low-grade iron and high-titanium blast furnace slag, and then carrying out magnetic separation in 3000 Gauss 2000-plus and 1000-Gauss 500-plus magnetic fields in sequence to obtain iron slag;
(2) crushing the iron slag obtained in the step (1), mixing the crushed iron slag with a reducing agent according to the weight ratio of 2-4:1, and drying to obtain a mixture;
(3) preheating the mixture obtained in the step (2) at the temperature of 400-;
(4) and (4) briquetting the magnetic separation iron obtained in the step (3) under the condition of 2-3t/cm linear pressure to obtain low-grade iron and high-titanium blast furnace slag to prepare a hot briquette.
Further, in the step (1), the magnetic iron grade of the slag iron is lower than 30%, and the granularity is less than 10 mm.
Further, in the step (1), the low-grade iron high-titanium blast furnace slag comprises the following components in percentage by weight: 41-54.11% of total iron, 12-29% of magnetic iron, 2.7-3.5% of magnesium oxide, 6.2-7.5% of aluminum oxide, 6.5-10.3% of silicon dioxide, 6.1-11.4% of calcium oxide, 5.1-9.4% of titanium dioxide and the balance of water.
Further, in the step (2), the iron slag is crushed to be less than 1.5 mm.
Further, in the step (2), the reducing agent is anthracite or carbon black.
Further, in the step (2), the crushed iron slag and the reducing agent are mixed according to the weight ratio of 3: 1.
Further, in the step (2), the moisture content in the mixture is less than 3%.
In summary, the invention has the following advantages:
1. the preparation process disclosed by the invention is simple and easy to control, reasonably utilizes iron in the low-grade iron high-titanium blast furnace slag, prepares the iron into hot-pressed blocks, can be directly put into a furnace for use, and effectively solves the problems of high difficulty in separating iron from slag, high treatment cost, easiness in generating secondary pollution and the like in the prior art.
2. During preparation, firstly crushing and magnetically separating low-grade iron and high-titanium blast furnace slag to obtain slag iron with the granularity of less than 10mm, then crushing again, mixing the slag iron with anthracite or carbon serving as a reducing agent to obtain a mixture, and drying in advance to reduce the moisture content in the mixture to prepare for later reduction; the mixture is subjected to three stages of preheating, reducing and cooling, the mixture is preheated in a reducing furnace, the moisture of the mixture is completely evaporated, then the temperature is raised to high temperature for reducing, at the moment, the ferric oxide is fully reduced to form simple substance iron, then the temperature is reduced to below 200 ℃, the simple substance iron is cooled, and magnetic separation and crushing are carried out again to obtain magnetic separation iron; the magnetic iron is subjected to hot press molding, so that hot-pressed blocks can be obtained, and the hot-pressed blocks can be directly put into a furnace for smelting and are convenient to use.
3. The method can carry out secondary utilization on the low-grade iron in the high-titanium blast furnace slag, improve the utilization rate of the high-titanium blast furnace slag and reduce the problem of environmental pollution caused by the blast furnace slag, crush and magnetically select the low-grade iron in the high-titanium blast furnace slag, mix the low-grade iron with a reducing agent, then sequentially preheat, reduce and cool the mixture, and reheat and press the mixture to obtain the hot-pressed block, has simple preparation flow, can quickly obtain the hot-pressed block with higher quality, can be directly put into a furnace for use, does not need to carry out additional treatment, and reduces the production cost; compared with the existing method, the separation difficulty of the slag and the iron in the preparation process is lower, and the recycling of low-grade iron in the high-titanium blast furnace slag is convenient.
Detailed Description
Example 1
A method for preparing hot-pressed blocks by using low-grade iron and high-titanium blast furnace slag comprises the following steps:
(1) crushing the low-grade iron and high-titanium blast furnace slag, and then carrying out magnetic separation in 2000 gauss and 500 gauss magnetic fields in sequence to obtain iron slag; the magnetic iron grade of the slag iron is lower than 30%, and the granularity is less than 10 mm;
(2) crushing the iron slag obtained in the step (1) to below 1.5mm, mixing the crushed iron slag with anthracite or carbon black according to the weight ratio of 2:1, and drying to obtain a mixture with the moisture content of less than 3%;
(3) preheating the mixture obtained in the step (2) at the temperature of 400 ℃, then reducing at the temperature of 1200 ℃, cooling to the temperature below 200 ℃, and sequentially carrying out magnetic separation and crushing to obtain magnetic separation iron;
(4) and (4) briquetting the magnetic separation iron obtained in the step (3) under the linear pressure condition of 2t/cm to obtain low-grade iron and high-titanium blast furnace slag to prepare a hot briquetting.
Example 2
A method for preparing hot-pressed blocks by using low-grade iron and high-titanium blast furnace slag comprises the following steps:
(1) crushing the low-grade iron and high-titanium blast furnace slag, and then carrying out magnetic separation in magnetic fields of 2300 Gauss and 700 Gauss in sequence to obtain iron slag; the magnetic iron grade of the slag iron is lower than 30%, and the granularity is less than 10 mm;
(2) crushing the iron slag obtained in the step (1) to below 1.5mm, mixing the crushed iron slag with anthracite or carbon black according to the weight ratio of 3:1, and drying to obtain a mixture with the moisture content of less than 3%;
(3) preheating the mixture obtained in the step (2) at the temperature of 450 ℃, then reducing at the temperature of 1200 ℃, cooling to the temperature below 200 ℃, and sequentially carrying out magnetic separation and crushing to obtain magnetic separation iron;
(4) and (4) briquetting the magnetic separation iron obtained in the step (3) under the condition of 2.5t/cm linear pressure to obtain low-grade iron and high-titanium blast furnace slag to prepare a hot briquette.
Example 3
A method for preparing hot-pressed blocks by using low-grade iron and high-titanium blast furnace slag comprises the following steps:
(1) crushing the low-grade iron and high-titanium blast furnace slag, and then carrying out magnetic separation in magnetic fields of 2600 gausses and 800 gausses in sequence to obtain iron slag; the magnetic iron grade of the slag iron is lower than 30%, and the granularity is less than 10 mm;
(2) crushing the iron slag obtained in the step (1) to below 1.5mm, mixing the crushed iron slag with anthracite or carbon black according to the weight ratio of 3:1, and drying to obtain a mixture with the moisture content of less than 3%;
(3) preheating the mixture obtained in the step (2) at the temperature of 500 ℃, then reducing at the temperature of 1250 ℃, cooling to the temperature below 200 ℃, and sequentially carrying out magnetic separation and crushing to obtain magnetic separation iron;
(4) and (4) briquetting the magnetic separation iron obtained in the step (3) under the linear pressure condition of 2.5t/cm to obtain low-grade iron and high-titanium blast furnace slag to prepare a hot briquette.
Example 4
A method for preparing hot-pressed blocks by using low-grade iron and high-titanium blast furnace slag comprises the following steps:
(1) crushing the low-grade iron and high-titanium blast furnace slag, and then carrying out magnetic separation in magnetic fields of 3000 gauss and 1000 gauss in sequence to obtain iron slag; the magnetic iron grade of the slag iron is lower than 30%, and the granularity is less than 10 mm;
(2) crushing the iron slag obtained in the step (1) to below 1.5mm, mixing the crushed iron slag with anthracite or carbon black according to the weight ratio of 4:1, and drying to obtain a mixture with the moisture content of less than 3%;
(3) preheating the mixture obtained in the step (2) at the temperature of 600 ℃, then reducing at the temperature of 1300 ℃, cooling to below 200 ℃, and sequentially carrying out magnetic separation and crushing to obtain magnetic separation iron;
(4) and (4) briquetting the magnetic separation iron obtained in the step (3) under the condition of 3t/cm linear pressure to obtain low-grade iron and high-titanium blast furnace slag to prepare a hot briquetting.
The contents of magnetic iron (MFe) in the low-grade iron-high titanium type blast furnace slag before production and the hot briquettes after production in examples 1 to 4 were measured, respectively, and the results are shown in Table 1. (Note: the magnetic iron content of the hot-pressed briquette after preparation was determined by magnetic separation of iron)
TABLE 1 examples 1-4 magnetic iron content before and after preparation
As can be seen from Table 1, the method can screen out the low-grade iron in the low-grade iron high-titanium blast furnace slag through a series of steps of crushing, magnetism and follow-up, and can manufacture the hot-pressed blocks with higher magnetic iron content; the hot-pressing block can be directly put into a furnace for use without additional treatment, so that the production cost is reduced, and the recycling of low-grade iron in the high-titanium blast furnace slag is facilitated.
While the present invention has been described in detail with reference to the specific embodiments thereof, it should not be construed as limited by the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (5)
1. The method for preparing the hot-pressed blocks by using the low-grade iron and high-titanium blast furnace slag is characterized by comprising the following steps of:
(1) crushing the low-grade iron and high-titanium blast furnace slag, and then carrying out magnetic separation in 3000 Gauss 2000-plus and 1000-Gauss 500-plus magnetic fields in sequence to obtain iron slag;
(2) crushing the iron slag obtained in the step (1), mixing the crushed iron slag with a reducing agent according to the weight ratio of 3:1, and drying to obtain a mixture; the reducing agent is anthracite or carbon black;
(3) preheating the mixture obtained in the step (2) at the temperature of 400-;
(4) and (4) briquetting the magnetic separation iron obtained in the step (3) under the linear pressure condition of 2-3t/cm to obtain low-grade iron and high-titanium blast furnace slag for preparing hot briquettes.
2. The method for producing the hot briquettes made of the low-grade iron high titanium blast furnace slag as claimed in claim 1, wherein in the step (1), the magnetic iron grade of the iron slag is less than 30% and the grain size is less than 10 mm.
3. The method for preparing the hot briquettes from the low-grade iron high-titanium blast furnace slag according to claim 1, wherein in the step (1), the low-grade iron high-titanium blast furnace slag comprises the following components in percentage by weight: 41-54.11% of total iron, 12-29% of magnetic iron, 2.7-3.5% of magnesium oxide, 6.2-7.5% of aluminum oxide, 6.5-10.3% of silicon dioxide, 6.1-11.4% of calcium oxide, 5.1-9.4% of titanium dioxide and the balance of water.
4. The method for producing the hot briquettes made of the low-grade iron and high titanium type blast furnace slag of claim 1, wherein in the step (2), the iron slag is crushed to 1.5mm or less.
5. The method for preparing the hot briquettes with the low-grade iron and high titanium blast furnace slag as claimed in claim 1, wherein in the step (2), the moisture content in the mixture is less than 3%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2069231C1 (en) * | 1996-04-19 | 1996-11-20 | Заболотный Василий Васильевич | Method of separating pig iron and final titanium-containing slag |
| CN1478908A (en) * | 2002-08-29 | 2004-03-03 | 中国科学院过程工程研究所 | Method and device for separating iron and titanium to prepare high titanium slag |
| JP4153281B2 (en) * | 2002-10-08 | 2008-09-24 | 株式会社神戸製鋼所 | Method for producing titanium oxide-containing slag |
| CN101229526A (en) * | 2007-12-13 | 2008-07-30 | 攀枝花环业冶金渣开发有限责任公司 | Method of using blast furnace scrap iron in slag to prepare puron materiel |
| CN102430472A (en) * | 2011-12-26 | 2012-05-02 | 东北大学 | Direct reduction-magnetic separation method of vanadium titanomagnetite |
| CN103374635B (en) * | 2012-04-16 | 2015-03-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Blast furnace slag recycling method |
| CN103014196A (en) * | 2012-12-26 | 2013-04-03 | 攀枝花钢城集团有限公司 | Application method of blast furnace slag fine stuff |
| CN105671306A (en) * | 2016-03-21 | 2016-06-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for separating iron, vanadium and titanium in vanadic titanomagnetite |
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